Why st5.org?

In short: nothing special. I registered this domain in 2004, back when revealing your real identity on the Internet had not yet been made popular by Mark Zuckerberg, and I just wanted it to be as short as possible. All 2-letter and 3-letter domains were already registered at the time, so I searched for other options and found that st5.org was free. Over time, I found out that it is also the name of a protein and a NASA project!